<template>
    <div class="login">
        <div class="login_box">
            <div class="avatar_box">
                <img src="../assets/logo.png" alt="">
            </div>
            <!-- 登录表单 -->
            <el-form ref="loginFormRef" class="login_form" :model="loginForm" :rules="loginFormRules">
                <!-- 用户名 -->
                <el-form-item prop="username">
                <el-input  prefix-icon="iconfont icon-user" v-model="loginForm.username"></el-input>
                </el-form-item>
                <!-- 密码 -->
                <el-form-item prop="password">
                <el-input type="password"  prefix-icon="iconfont icon-3702mima" v-model="loginForm.password"></el-input>
                </el-form-item>
                <el-form-item class="btns">
                    <el-button type="primary" @click="login">登录</el-button>
                    <el-button type="info" @click="resetLoginForm">重置</el-button>
                </el-form-item>
            </el-form>
        </div>
    </div>
</template>

<script>
export default {
    name:'Login',
    data(){
        return {
            // 真是登录表单的数据绑定
            loginForm:{
                username:'admin',
                password:'123456'
            },
            // 这是表单的验证规则
            loginFormRules:{
                // 验证用户名是否合法
                username:[
                    { required: true, message: '请输入活动名称', trigger: 'blur' },
                    { min: 3, max: 5, message: '长度在 3 到 10 个字符', trigger: 'blur' }
                ],
                // 验证密码是否合法
                password:[
                    { required: true, message: '请输入登录密码', trigger: 'blur' },
                    { min: 6, max: 15, message: '长度在 6 到 15 个字符', trigger: 'blur' }
                ]
            }
        }
    },
    methods:{
        // 点击重置按钮，重置登录表单
        resetLoginForm(){
            console.log(this);
            this.$refs.loginFormRef.resetFields();
        },
        // 表单登录前的预验证
        login(){
            this.$refs.loginFormRef.validate(async valid => {
                console.log(valid);
                // 如果验证不通过
                if(!valid) return;
                const {data:res} = await this.$http.post('login',this.loginForm);
                console.log(res);
                // 判断登录是否成功
                if(res.meta.status !== 200) return this.$message.error('登录失败');
                this.$message.success('登录成功');
                // 1.将登录成功之后的token，保存到客户端的sessionStorage中
                    // 1.1项目中除了登录之外的其他api节后，必须在登录之后才能访问
                    // 1.2token只应在当前网站打开期间神效，所以将token保存在sessionStorage中
                // 2.通过编程试导航跳转到后台主页，路由地址shi‘/home’
                window.sessionStorage.setItem('token',res.data.token);
                this.$router.push('/home');
            })
        }
    }
}
</script>

<style>
.login{
    background-color: #2b4b6b;
    height: 100%;
}
.login_box{
    width: 450px;
    height: 300px;
    background-color: #fff;
    border-radius: 3px;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%,-50%);
}
.avatar_box{
    height: 130px;
    width: 130px;
    border: 1px solid #eee;
    border-radius: 50%;
    padding: 10px;
    box-shadow: 0 0 10px #ddd;
    position: absolute;
    left: 50%;
    transform: translate(-50%,-50%);
    background-color: #fff;
}
.avatar_box img {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background-color: #eee;
}
.btns{
    display: flex;
    justify-content: center;
}
.login_form{
    position: absolute;
    bottom: 0;
    width: 100%;
    padding: 0 20px;
}
</style>